| /* |
| * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * common internal API header |
| */ |
| |
| #ifndef AVUTIL_INTERNAL_H |
| #define AVUTIL_INTERNAL_H |
| |
| #if !defined(DEBUG) && !defined(NDEBUG) |
| # define NDEBUG |
| #endif |
| |
| #include <limits.h> |
| #include <stdint.h> |
| #include <stddef.h> |
| #include <assert.h> |
| #include "config.h" |
| #include "attributes.h" |
| #include "timer.h" |
| #include "cpu.h" |
| #include "dict.h" |
| #include "macros.h" |
| #include "pixfmt.h" |
| #include "version.h" |
| |
| #if ARCH_X86 |
| # include "x86/emms.h" |
| #endif |
| |
| #ifndef emms_c |
| # define emms_c() while(0) |
| #endif |
| |
| #ifndef attribute_align_arg |
| #if ARCH_X86_32 && AV_GCC_VERSION_AT_LEAST(4,2) |
| # define attribute_align_arg __attribute__((force_align_arg_pointer)) |
| #else |
| # define attribute_align_arg |
| #endif |
| #endif |
| |
| #if defined(_MSC_VER) && CONFIG_SHARED |
| # define av_export __declspec(dllimport) |
| #else |
| # define av_export |
| #endif |
| |
| #if HAVE_PRAGMA_DEPRECATED |
| # if defined(__ICL) || defined (__INTEL_COMPILER) |
| # define FF_DISABLE_DEPRECATION_WARNINGS __pragma(warning(push)) __pragma(warning(disable:1478)) |
| # define FF_ENABLE_DEPRECATION_WARNINGS __pragma(warning(pop)) |
| # elif defined(_MSC_VER) |
| # define FF_DISABLE_DEPRECATION_WARNINGS __pragma(warning(push)) __pragma(warning(disable:4996)) |
| # define FF_ENABLE_DEPRECATION_WARNINGS __pragma(warning(pop)) |
| # else |
| # define FF_DISABLE_DEPRECATION_WARNINGS _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"") |
| # define FF_ENABLE_DEPRECATION_WARNINGS _Pragma("GCC diagnostic warning \"-Wdeprecated-declarations\"") |
| # endif |
| #else |
| # define FF_DISABLE_DEPRECATION_WARNINGS |
| # define FF_ENABLE_DEPRECATION_WARNINGS |
| #endif |
| |
| |
| #define FF_MEMORY_POISON 0x2a |
| |
| #define MAKE_ACCESSORS(str, name, type, field) \ |
| type av_##name##_get_##field(const str *s) { return s->field; } \ |
| void av_##name##_set_##field(str *s, type v) { s->field = v; } |
| |
| // Some broken preprocessors need a second expansion |
| // to be forced to tokenize __VA_ARGS__ |
| #define E1(x) x |
| |
| /* Check if the hard coded offset of a struct member still matches reality. |
| * Induce a compilation failure if not. |
| */ |
| #define AV_CHECK_OFFSET(s, m, o) struct check_##o { \ |
| int x_##o[offsetof(s, m) == o? 1: -1]; \ |
| } |
| |
| #define LOCAL_ALIGNED_A(a, t, v, s, o, ...) \ |
| uint8_t la_##v[sizeof(t s o) + (a)]; \ |
| t (*v) o = (void *)FFALIGN((uintptr_t)la_##v, a) |
| |
| #define LOCAL_ALIGNED_D(a, t, v, s, o, ...) \ |
| DECLARE_ALIGNED(a, t, la_##v) s o; \ |
| t (*v) o = la_##v |
| |
| #define LOCAL_ALIGNED(a, t, v, ...) E1(LOCAL_ALIGNED_A(a, t, v, __VA_ARGS__,,)) |
| |
| #if HAVE_LOCAL_ALIGNED_8 |
| # define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_D(8, t, v, __VA_ARGS__,,)) |
| #else |
| # define LOCAL_ALIGNED_8(t, v, ...) LOCAL_ALIGNED(8, t, v, __VA_ARGS__) |
| #endif |
| |
| #if HAVE_LOCAL_ALIGNED_16 |
| # define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_D(16, t, v, __VA_ARGS__,,)) |
| #else |
| # define LOCAL_ALIGNED_16(t, v, ...) LOCAL_ALIGNED(16, t, v, __VA_ARGS__) |
| #endif |
| |
| #if HAVE_LOCAL_ALIGNED_32 |
| # define LOCAL_ALIGNED_32(t, v, ...) E1(LOCAL_ALIGNED_D(32, t, v, __VA_ARGS__,,)) |
| #else |
| # define LOCAL_ALIGNED_32(t, v, ...) LOCAL_ALIGNED(32, t, v, __VA_ARGS__) |
| #endif |
| |
| #define FF_ALLOC_OR_GOTO(ctx, p, size, label)\ |
| {\ |
| p = av_malloc(size);\ |
| if (!(p) && (size) != 0) {\ |
| av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\ |
| goto label;\ |
| }\ |
| } |
| |
| #define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\ |
| {\ |
| p = av_mallocz(size);\ |
| if (!(p) && (size) != 0) {\ |
| av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\ |
| goto label;\ |
| }\ |
| } |
| |
| #define FF_ALLOC_ARRAY_OR_GOTO(ctx, p, nelem, elsize, label)\ |
| {\ |
| p = av_malloc_array(nelem, elsize);\ |
| if (!p) {\ |
| av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\ |
| goto label;\ |
| }\ |
| } |
| |
| #define FF_ALLOCZ_ARRAY_OR_GOTO(ctx, p, nelem, elsize, label)\ |
| {\ |
| p = av_mallocz_array(nelem, elsize);\ |
| if (!p) {\ |
| av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\ |
| goto label;\ |
| }\ |
| } |
| |
| #include "libm.h" |
| |
| /** |
| * Return NULL if CONFIG_SMALL is true, otherwise the argument |
| * without modification. Used to disable the definition of strings |
| * (for example AVCodec long_names). |
| */ |
| #if CONFIG_SMALL |
| # define NULL_IF_CONFIG_SMALL(x) NULL |
| #else |
| # define NULL_IF_CONFIG_SMALL(x) x |
| #endif |
| |
| /** |
| * Define a function with only the non-default version specified. |
| * |
| * On systems with ELF shared libraries, all symbols exported from |
| * FFmpeg libraries are tagged with the name and major version of the |
| * library to which they belong. If a function is moved from one |
| * library to another, a wrapper must be retained in the original |
| * location to preserve binary compatibility. |
| * |
| * Functions defined with this macro will never be used to resolve |
| * symbols by the build-time linker. |
| * |
| * @param type return type of function |
| * @param name name of function |
| * @param args argument list of function |
| * @param ver version tag to assign function |
| */ |
| #if HAVE_SYMVER_ASM_LABEL |
| # define FF_SYMVER(type, name, args, ver) \ |
| type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver); \ |
| type ff_##name args |
| #elif HAVE_SYMVER_GNU_ASM |
| # define FF_SYMVER(type, name, args, ver) \ |
| __asm__ (".symver ff_" #name "," EXTERN_PREFIX #name "@" ver); \ |
| type ff_##name args; \ |
| type ff_##name args |
| #endif |
| |
| /** |
| * Return NULL if a threading library has not been enabled. |
| * Used to disable threading functions in AVCodec definitions |
| * when not needed. |
| */ |
| #if HAVE_THREADS |
| # define ONLY_IF_THREADS_ENABLED(x) x |
| #else |
| # define ONLY_IF_THREADS_ENABLED(x) NULL |
| #endif |
| |
| /** |
| * Log a generic warning message about a missing feature. |
| * |
| * @param[in] avc a pointer to an arbitrary struct of which the first |
| * field is a pointer to an AVClass struct |
| * @param[in] msg string containing the name of the missing feature |
| */ |
| void avpriv_report_missing_feature(void *avc, |
| const char *msg, ...) av_printf_format(2, 3); |
| |
| /** |
| * Log a generic warning message about a missing feature. |
| * Additionally request that a sample showcasing the feature be uploaded. |
| * |
| * @param[in] avc a pointer to an arbitrary struct of which the first field is |
| * a pointer to an AVClass struct |
| * @param[in] msg string containing the name of the missing feature |
| */ |
| void avpriv_request_sample(void *avc, |
| const char *msg, ...) av_printf_format(2, 3); |
| |
| #if HAVE_LIBC_MSVCRT |
| #include <crtversion.h> |
| #if defined(_VC_CRT_MAJOR_VERSION) && _VC_CRT_MAJOR_VERSION < 14 |
| #pragma comment(linker, "/include:" EXTERN_PREFIX "avpriv_strtod") |
| #pragma comment(linker, "/include:" EXTERN_PREFIX "avpriv_snprintf") |
| #endif |
| |
| #define avpriv_open ff_open |
| #define PTRDIFF_SPECIFIER "Id" |
| #define SIZE_SPECIFIER "Iu" |
| #else |
| #define PTRDIFF_SPECIFIER "td" |
| #define SIZE_SPECIFIER "zu" |
| #endif |
| |
| #ifdef DEBUG |
| # define ff_dlog(ctx, ...) av_log(ctx, AV_LOG_DEBUG, __VA_ARGS__) |
| #else |
| # define ff_dlog(ctx, ...) do { if (0) av_log(ctx, AV_LOG_DEBUG, __VA_ARGS__); } while (0) |
| #endif |
| |
| /** |
| * Clip and convert a double value into the long long amin-amax range. |
| * This function is needed because conversion of floating point to integers when |
| * it does not fit in the integer's representation does not necessarily saturate |
| * correctly (usually converted to a cvttsd2si on x86) which saturates numbers |
| * > INT64_MAX to INT64_MIN. The standard marks such conversions as undefined |
| * behavior, allowing this sort of mathematically bogus conversions. This provides |
| * a safe alternative that is slower obviously but assures safety and better |
| * mathematical behavior. |
| * @param a value to clip |
| * @param amin minimum value of the clip range |
| * @param amax maximum value of the clip range |
| * @return clipped value |
| */ |
| static av_always_inline av_const int64_t ff_rint64_clip(double a, int64_t amin, int64_t amax) |
| { |
| int64_t res; |
| #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2 |
| if (amin > amax) abort(); |
| #endif |
| // INT64_MAX+1,INT64_MIN are exactly representable as IEEE doubles |
| // do range checks first |
| if (a >= 9223372036854775808.0) |
| return amax; |
| if (a <= -9223372036854775808.0) |
| return amin; |
| |
| // safe to call llrint and clip accordingly |
| res = llrint(a); |
| if (res > amax) |
| return amax; |
| if (res < amin) |
| return amin; |
| return res; |
| } |
| |
| /** |
| * Compute 10^x for floating point values. Note: this function is by no means |
| * "correctly rounded", and is meant as a fast, reasonably accurate approximation. |
| * For instance, maximum relative error for the double precision variant is |
| * ~ 1e-13 for very small and very large values. |
| * This is ~2x faster than GNU libm's approach, which is still off by 2ulp on |
| * some inputs. |
| * @param x exponent |
| * @return 10^x |
| */ |
| static av_always_inline double ff_exp10(double x) |
| { |
| return exp2(M_LOG2_10 * x); |
| } |
| |
| static av_always_inline float ff_exp10f(float x) |
| { |
| return exp2f(M_LOG2_10 * x); |
| } |
| |
| /** |
| * A wrapper for open() setting O_CLOEXEC. |
| */ |
| av_warn_unused_result |
| int avpriv_open(const char *filename, int flags, ...); |
| |
| int avpriv_set_systematic_pal2(uint32_t pal[256], enum AVPixelFormat pix_fmt); |
| |
| static av_always_inline av_const int avpriv_mirror(int x, int w) |
| { |
| if (!w) |
| return 0; |
| |
| while ((unsigned)x > (unsigned)w) { |
| x = -x; |
| if (x < 0) |
| x += 2 * w; |
| } |
| return x; |
| } |
| |
| void ff_check_pixfmt_descriptors(void); |
| |
| extern const uint8_t ff_reverse[256]; |
| |
| #endif /* AVUTIL_INTERNAL_H */ |